obtained the government investigation video and showed it to hull for the first time. >> i'm just amazed that i'm even here. i remembering hearing a loud noise. >> smith: a huge piece of steel broke lose. >> my head was jammed into the piece of steel and knocked me out. >> smith: hull fell 240 feet, but his life was spared after his safety harness broke the fall. >> the operator pulled the wrong lever. frankie was with me on the trip from nebraska to texas and back. >> neither one of us was rested. and we have the end result that we do today. >> smith: hull suffered severe internal injuries and is now permanently disabled. >> it was a bad day. or a good day, whichever way you want to look at it. i walked away from it. >> smith: so a lot of time pressure. you saw that often in your work? >> all the time. >> smith: all the time? >> we saw it all the time. >> smith: veteran climbers like wally reardon say that time pressure often leads to something called free climbing. >> free climbing's any time when a person's climbing on a tower where you're not connected to a fall arrest system. >> smi

in a small segment of the population. we know that. the federal government knows it. they pay money to kids who've been injured that way. this is something that's been known for years. and then we also know that the number of vaccines given has risen dramatically. so it does not take a rocket scientist to draw a possible correlation between the vaccines being given and the brain injury that our children are suffering, because autism is brain injury. >> narrator: combining his resources and her celebrity, handley and mccarthy have been highly effective at organizing a movement of concerned parents. >> hi, i'm jenny mccarthy. i am here today to beg you guys... >> narrator: the science that gave the movement its originalw impetus was a 1998 article by british gastroenterologist andrew wakefield in the medical journal the "lancet." he reported on 12 children with gastrointestinal problems, eight of whom developed symptoms of autism following an mmr shot. wakefield's theory was that the measles vaccine inflamed the intestines, causing harmful proteins to leak into the bloodstream, eventually dam

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